Science Advances

This PDF file includes:

• Supplementary Text
• Fig. S1. Bayesian ages of Block A OSL columns.
• Fig. S2. Regenerative growth curves and plots of D_e values for six OSL samples.
• Fig. S3. Preheat dose recovery test for sample BG4066 that was completed for two initial doses of 8 and 31 Gy.
• Fig. S4. Diagnostic Folsom and Clovis artifacts.
• Fig. S5. Clovis bifaces.
• Fig. S6. Pre-Clovis projectile points.
• Fig. S7. Pre-Clovis bifaces.
• Fig. S8. Use-wear on pre-Clovis artifacts.
• Table S1. OSL ages on 4- to 11-μm quartz grains for sediments from the Debra L. Friedkin site, Texas.
• Table S2. Correlation of OSL ages with archaeological horizons.
• Table S3. Clovis, Folsom, and Buttermilk Creek Complex bifaces.
• References (47, 48)

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